work on datapack support

nms/v1_20R1/src/main/kotlin/xyz/alexcrea/cuanvil/dependency/datapack/DataPackTester.kt

@@ -0,0 +1,30 @@
+package xyz.alexcrea.cuanvil.dependency.datapack
+
+import io.papermc.paper.datapack.Datapack
+import org.bukkit.Bukkit
+import java.util.*
+
+object DataPackTester {
+    val legacyNames: List<String>
+        get() = Bukkit.getDataPackManager().dataPacks
+            .stream().filter { obj -> obj.isEnabled }
+            .map { pack -> pack.key.key }
+            .toList()
+
+    val enabledPacks: List<String>
+        get() {
+            try {
+                // will throw error if do not exist
+                Bukkit::class.java.getDeclaredMethod("getDatapackManager")
+
+                return Bukkit.getDatapackManager().enabledPacks
+                    .stream().map { obj: Datapack -> obj.name }
+                    .toList()
+            } catch (e: NoSuchMethodException) {
+                return legacyNames
+            } catch (e: Exception){
+                // Assume cause UnimplementedOperationException on mock server
+                return Collections.emptyList()
+            }
+        }
+}